Fast way to move one vertex point to another in the UV/Image Editor?
You can toggle the Snap tool in the UV Editor's header by clicking the magnet icon or using the keyboard shortcut ShiftTab. Then click the popover dropdown beside it and enable the element snapping type of Vertex.


Instead of frequently toggling the Snap tool on and off by clicking the magnet icon, simply hold down Ctrl while manipulating the UVs to temporarily activate snapping. (You still have to make sure you are in Vertex snapping mode.)